821868118 has 8 divisors (see below), whose sum is σ = 1239689880. Its totient is φ = 408638160.

The previous prime is 821868107. The next prime is 821868119. The reversal of 821868118 is 811868128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821868119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1147503 + ... + 1148218.

It is an arithmetic number, because the mean of its divisors is an integer number (154961235).

Almost surely, 2^821868118 is an apocalyptic number.

821868118 is a deficient number, since it is larger than the sum of its proper divisors (417821762).

821868118 is a wasteful number, since it uses less digits than its factorization.

821868118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295902.

The product of its digits is 49152, while the sum is 43.

The square root of 821868118 is about 28668.2423249142. The cubic root of 821868118 is about 936.7004118714.

The spelling of 821868118 in words is "eight hundred twenty-one million, eight hundred sixty-eight thousand, one hundred eighteen".